The journal of the Horticultural Society of London . t a stake may be set upright inany weather, and the vertical line determined instantly; tenobservations may be made with this tool whilst the masonsplumb-rule is being adjusted to make one; and the same may besaid of the horizontal line, for it is no easy matter to get thespirit-level accurately adjusted ; and that most valuable tool, themasons level, is miserably slow in its movements in all weathers,and in windy weather it will not give a true line at all, whereasthis little implement not only tells instantly when the bed islevel on which
The journal of the Horticultural Society of London . t a stake may be set upright inany weather, and the vertical line determined instantly; tenobservations may be made with this tool whilst the masonsplumb-rule is being adjusted to make one; and the same may besaid of the horizontal line, for it is no easy matter to get thespirit-level accurately adjusted ; and that most valuable tool, themasons level, is miserably slow in its movements in all weathers,and in windy weather it will not give a true line at all, whereasthis little implement not only tells instantly when the bed islevel on which it lies, but tells how far it is from that point incase the bed be an inclined plane, thereby giving a regular fallto drains, &c., where inclined planes are wanted. The Level is constructed upon the principle of the hour-glass,and, by a particular character of sand, the lines are given very fine. The accompanying sketch will give an accurate idea of thedial of the contrivance. No scale is needed, as the sketch is thefull size of the 200 SOMK ACCOUNT OF A NKW LEVEL. The first was made three years ago ; the subject lias beencarefully digested since, and it is to be hoped tliat tliis will provea most valuable implement in the ordinary operations t>f horti-culture long after the inventor has been forgotten. In appearance the instrument is something like half a dimensions are 3^ inches X 3^ x ^^^ The diagram represents the face of it, in which two cavitiesare cut out so as to form each a quadrant of a circle, as appearsby the degrees marked. Some fine sand, like that used for hour-glasses, is enclosed in these cavities by glazing in front. Thesand falls from the upper part through a small hole into thelower, as in the conmion hour-glass. Jhe particles of sand fallso continuously that they form in appearance a tolerably fineline. If the instnnnent be placed upon anything that is trulyhorizontal the sand will fall, as a plunnnet would, from the smallhole in t
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Keywords: ., booksubjectfruitculture, booksubjectgardening, booksubjecthortic
